Udo's Choice Advanced Adult's Probiotic has 7 strains of senior-specific friendly bacteria for those 55 and over. Advanced Adult's Probiotic contains a much higher percentage of Bifido bacteria per serving than the adult formula to meet the specific digestive needs of seniors. Formulated to help promote health and longevity in seniors by supporting the development of healthy microflora in the small and large intestine. This formula has been designed to support the healthy development of flora and promote proper digestion.*